Raised printing.



S. LlPSlUS.

RAISED PRINTING. APPLICATION FILED JAN. 12. 1911.

Patented A r. 9,1918.

. 11 I I l l I LEGLQGa SAMUEL LIPSIUS, OF NEW YORK, N. Y.

RAISED PRINTING.

Specification of Letters Patent.

Patented Apr. 9, 1918.

Application filed January 12, 1917. Serial No. 141,944.

To all whom it may concern:

Be it known that I, SAMUEL LIPsIUs, a citizen of the United States of America, residing at New York, N. Y have invented a new and useful Raised Printing, of which the following is a specification.

This invention relates to the art of producing relief or raised effects by printing, covering'the printed matter with a fusible powder and then heating to fuse the powder and special object's 'of'rny invention are to secure a more accurate control of the fusing heat. and to so concentrate the heat as to enable the reduction in size of the apparatus.

Another special object is to adapt the machine for handling the usual letter heads and the like, or for handling the heavier products such as cardboard and to provide for the attainment of the greater heat necessary in handling the cardboard products.

A further object is to enable the treat; ment of diflerentareas of the sheets to different intensities of heat to suit the density of the printing which may occupy the different portions of the sheet.

In the accomplishment of the foregoing I construct a heater having a substantially closed heating chamber in which the burners or other heatin element is located and transport the printed and powdered sheets on a traveling conveyer across the heated top of said chamber. Preferably the top of the heating chamber is made in the form of a dome so as to concentrate the heat and when burners are employed air inlets are sheet to different degrees of heat is obtained? by the provision of independently controllable heaters disposed at different points transversely of the oven.-

Other features and details of construction will appear as the specification proceeds.

In the accompanying drawin I have illustrated my invention embodied in a practical and preferred form but I would have it understood that various changes and modiof the machine, made up fications may be made without departing from the true spirit and scope of the in-- vention.

In this drawing: Figure 1, is a side and vertical sectional view of a form of the apparatus with parts broken away for the sake of clearness.

Fig. 2, is a top plan view of the machine with parts broken away and shown in sec tion.

Fig. 3, is an enlarged broken sectional view illustrating more in detail the construction of the regulatable doors for conserving the heat.

Fig. 4 is a broken detail view of a slight modification wherein the conveyer is supported on rollers.

Considering the drawing now more in detail:

5 designates the so-called heating chamber in the illustration of side walls, a relatively flat bottom wall 1 top of the chamber is preferably perforated as indicated at 12 to permit the escape of gases of combustion, such'perforations being located at the side edges of the top so as to leave an imperforate area between the perforated areas forming a path for the sheets.

Where gaseous fuel burners are employed as the heating element each burner is preferably provided with a separate independently controlled mixing valve such as indicated at 13 and each burner is further independently controlled by a suitable control valve 14. By these means it is possible to control each burner independently of the other burners and so graduate the heat at different points transversely of the sheet path to suit different requirements. v

The sheets are conveyed over the domeshaped top of the heating chamber by'a suitable carrier, the same being here shown as an endless wire mesh conveyer 15 having its upper run traversing and supported on the top of the chamber and its lower run hanging below the bottom of the chamber, said -conveyer being supported at its ends and propelled by suitable rollers 16. By thus .allowing the lower run of the conveyer to hang free, suflicient weight is put upon the The dome top of the heating chamber is preferably made of sheet metal so as to readily transmit the heat to the sheets on the conveyer and the wire mesh conveyer in traversing the perforations in the dome breaks up the currents of heated air in a way to prevent dangerously hot currents impinging on the sheets. Furthermore the apparatus is preferably ofsuch a width that the imperforate area between the perforated side strips of the dome topis of a width equal to the width of the sheets normally used in the machine, thus providing an imperforate sheet path so that the sheets never come in contact with the heat currents coming through the perforated areas.

The heat is confined over the conveyer by a suitable cover 17 preferably dome-shaped and corresponding to the curvature of the heating chamber and avheat shield 18 may be placed below the lower run of the conveyer,

Where the heater is in the nature of a burner such as herein illustrated, said burner is preferably supported at such a heightthat the flame therefrom will actually contact the top plate so as to heat said top plate to a high degree. The conveyer traveling over in contact with or in close proximity to this highly heated top plate receives heat therefrom and provides access of the heat to the sheets carried thereby. A further factor enabling the rapid and thorough heating of the printed matter is the relatively stationary hood which covers the heated top plate and the conveyer. This prevents loss of heat and by confining the heat directly over the printed sheets, helps in producing rapid w'ork. Another important feature of the invention is that by the concentration of heat thus afi'orded cardboard and heavy paper stock may be rapidly heated to the desired extent, without scorching or burning the paper. The concentration and conservation of heat thus afforded by my invention furthermore enables the making of the machine in sizes much smaller than has heretofore been possible and this is of great advantage in the saving of space occupied, cost of necessary materials, etc.

The hood is placed high enough above the conveyer to provide sufiicient room for sheets which may have a tendency to curl. I have provided means however for cutting down this space and thus confining the heat more when operating upon cardboard and.

the heavier stocks which are free of the curling tendency, such means being in the form of doors 19 mounted on the ends of the hood and adjustable toward and away from the conveyer, said doors being held in their adjusted positions by set screws 20. In handling cards and the like these doors are lowered relatively close to the conveyer so as to conserve all the heat, thus providing for the additional heat necessary for operating on cards and. at the same time preventing useless waste of heat. When operating on lighter stocks the doors may be raised to a point where there will be no tion by equipping theconveyer with a great number of relatively small upstanding points or pins 21. One example of the use of this special conveyer is the case where raised printing is to be produced on both sides of the sheet. In such a case the first side of the work is printed and powdered with a powder which fuses only at relatively high temperature. When the reverse sides of the sheets are printed a powder of lower fusing point is used so that" it is not necessary to use so great a heat in passing the work through the heater the second time and as the work is supported on minute separated points no harm is done even though the raised printing on the first side should become softened somewhat in the second heating.

The advantages of the independently controlled heaters will be readily appreciated when it is realized that in the ordinary letter heads for instance, some parts of the printing are usually heavier or denser than others and so require a greater amount of heat to properly raise the printed matter.

- This is provided for with exactness in m invention by regulating the heat of the di ferent burners so as to produce the greatest heat at that point or points in the sheet path which are traversed by the heavier portions of the printed matter. A common example is the case of letter heads having a relatively large cut or the name of a firm at the center of the sheet and individual names, telephone numbers, etc., in smaller type at the sides of the sheet. In such a case the side burners or heaters are regulated to produce just sufficient heat to raise the relatively small work at the sides of the sheet and the center burner is regulated to provide a greater amount of heat to raise the larger work.

It is obvious that heaters other than those using gaseous fuel may be employed, electric heater particularly being desirable for this purpose on account of their cleanliness, freedom from smoke and flame and ease of regulation. i

A convenient method of providing the upstanding supporting points on the conveyers is to twist small pieces of wire about the wire mesh strands of the conveyer leaving the points of such wires upstanding to provide supporting prongs as illustrated in ers 22.

A convenient method of providing the dome of the heating chamber is to use a single arch-shaped piece of sheet metal such as shown in Fig. 3 secured at its ends beneath overturned flanges 23 at the ends of the bottom wall 6.

The sheets after being properly fused may be treated to a cooling process by discharging them onto a cooling conveyer 24 extending beneath the oven.

What I claim is:

1. Apparatus for producing raised rinting, comprising walls defining a su stantially closed'heating chamber, said heating chamber having air inlets in the bottom thereof and perforations in limited areas of the topthereof for escape of products of combustion, a fuel burner in the heating chamber, a conveyertraveling over the top of the heating chamber and a cover over said conveyer. v

2. Apparatus for producing raised printing comprising a heating chamber provided with a substantially dome-shaped top for concentrating the heat in the top portion of the chamber, said chamber having air inlets in the bottom thereof and perforations in the top thereof for escape of products of.

combustion, a fuel burner in said chamber, a conveyer traveling overthe dome-shaped top of the heating chamber and a cover over said conveyer.

bottom outside of the heating chamber and a cover over the upper run of the conveyer.

4. Apparatus for producing raised printing comprising a substantially closed heating chamber having a relatively flat bottom and a dome-shaped top, a heater in said heating chamber, an endless conveyer having its upper run traveling over the domeshaped top of the heating chamber and its lower run extending beneath the relatively fiat bottom of the heating chamber, a cover over the upper run of the conveyer and a heat shield beneath the lower run of the conveyer.

5. Apparatus for producing raised printing comprising a heating chamber having a dome-shaped top provided with perforations only along the edge portions thereof, a heater in said chamber, a conveyer traveling over the dome-shaped top of the conveyer and a cover over said conveyer.

6. Apparatus for producing raised print- I confine the heated products and having a metallic top wall, a burner immediately below and discharging against said metallic top wall, whereby said top wall is subjected to the entire heating effect of the burner, a perforated metallic sheet conveyer traveling over the thus highly heated top wall in close proximity thereto and deriving heat therefrom, and a relatively stationary hood housing said conveyer and the heated top wall to thereby confine the heat to the sheets carried by the conveyer.

7. Apparatus for producing raised printing, comprising a heating chamber closed to confine the heated products and having a metallic top wall, a burner immediately below and discharging against said metallic top wall, whereby said top wall is subjected to the entire heating effect of the burner, a perforated metallic sheet conveyer traveling over the thus highly heated top wall in close proximity thereto and deriving heat there'- -from, and azrelatively stationarv'hood'housing said conveyer and the heated top wall to thereby confine the heat to the sheets carried by the conveyer, said hood at the ends thereof being spaced above the conveyer a distance suflicient to enable sheets of a maximum thickness to be carried by the conveyer beneath the same and end doors adjustably supported and movable toward and away. from the conveyer at the ends of the hood to permit passage of variable thicknesses of sheets thereunder while confining the heat within the hood.

8. Apparatus for producing raised printcomprising a heating chamber closed to confine the heated products and havin a metallic top wall, a burner immediately elow and discharging against said metallic top wall, whereby said top wall is subJected to the entire heating efiect of the burner, a

perforated metallic sheet conveyer traveling chamber, a heater in said chamber, an endless conveyer having its upper run traveling over the top of the heating chamber and its lower run extending beneath and outside the bottom of the heating chamber, a heat shield beneath said lower run of the conveyer and a cooling conveyer beneath said heat shield. I

10. Apparatus for producing raised printing having areas of difi'erent-density to be raised, comprising an oven, a sheet conveyer for carrying the sheets through the oven, burners disposed substantially in line with the areas of different density of the sheets carried by the conveyer and means for independently controlling the burners to suit the densities of the several areas of the sheets.

11. Raised printing apparatus comprising a heated plate having an imperforate area in the center thereof constituting a sheet 1,2e1,eae

path and perforated areas at opposite sides of said imperforate sheet path and a sheet conveyer traversing said sheet path.

12. Apparatus for producing raised print ing comprising an oven, a conveyer traveling through said oven and independently regulatable heaters disposed beneath the edge portions of said conveyer and at a point intermediate said edge portions whereby dif-Y metal to and metallic conveyer to the sheets carried y said conveyer and a relatively.

stationary cover over said conveyer for conservin the heat thus applied to the sheets. 14. pparatus of the character described,

' comprising a heated top plate, a burner immediately below said top plate and supported with a flame therefrom impinging directly on saidtop plate to thereby heat said plate to a high degree, a perforate sheet c011 veyer traveling over said heated top plate and in close proximity thereto and a hood over said conveyer and heated top plate for confining the heat to the sheets on said conveyer.

SAMUEL LIPSIUS. 

